DOWNFLOW DUCT CONNECTORS
All downflow installations must use a suitable duct connector approved by the furnace manufacturer for use with this furnace. The duct connec- tors are designed to be connected to the rectangular duct under the floor and sealed. Refer to the instructions supplied with the duct con- nector for proper installation. Refer to the separate accessory parts list at the end of these instructions for the approved accessory duct con- nectors.
FURNACE
WARM AIR PLENUM
WITH 1” FLANGES
FIBERGLASS
INSULATION
FIBERGLASS TAPE
UNDER FLANGE
COMBUSTIBLE FLOOR
BASE ACCESSORY
FIGURE 2: Combustible Floor Base Accessory
RESIDENTIAL AND MODULAR HOME UPFLOW RETURN PLENUM CONNECTION
Return air may enter the furnace through the side(s) or bottom depend- ing on the type of application. Return air may not be connected into the rear panel of the unit.
BOTTOM RETURN AND ATTIC INSTALLATIONS
Bottom return applications normally pull return air through a base plat- form or return air plenum. Be sure the return platform structure or return air plenum is suitable to support the weight of the furnace.
The internal bottom panel must be removed for this application.
Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility.
HORIZONTAL APPLICATION
FIGURE 3: Horizontal Application (Typical)
This furnace may be installed in a horizontal position on either side as shown above. It must not be installed on its back.
ATTIC INSTALLATION
This appliance is certified for line contact when the furnace is installed in the horizontal left or right position. The line contact is only permissi- ble between lines that are formed by the intersection of the top and the two sides of the furnace and the building joists, studs, or framing. This line may be in contact with combustible material. Refer to Figure 10 for details and additional information.
Vent Pipe (Maintain required clearances to combustible materials)
Supply
Air
Return
Air
FIGURE 4: Typical Attic Installation
This appliance is certified for line contact when the furnace is installed in the horizontal left or right position. The line contact is only permissible between lines that are formed by the intersection of the top and two sides of the furnace and the building joists, studs or framing. This line may be in contact with combustible material. Refer to Figure 4.
When a furnace is installed in an attic or other insulated space, keep all insulating materials at least 12 inches (30.5 cm) away from furnace and burner combustion air openings.
During installation, doors must remain on the furnace when moving or lifting.
When moving or handling this furnace prior to installation, always leave the doors on the furnace to provide support and to prevent damage or warping of the cabinet. When lifting the furnace, support the ends of the furnace rather than lifting by the cabinet flanges at the return air openings (bottom or sides) or supply air opening.
It is acceptable to use the primary heat exchanger tubes as a lifting point provided that the tubes are lifted at the front of the heat exchang- ers where attached to the vestibule panel. Do not use the top return bend of the heat exchangers as lifting points as the tubes may shift out of position or their location brackets/baffles.
SUSPENDED FURNACE / CRAWL SPACE INSTALLATION
The furnace can be hung from floor joists or installed on suitable blocks or pads. Blocks or pad installations shall provide adequate height to ensure that the unit will not be subject to water damage.
Units may also be suspended from rafters or floor joists using rods, pipe angle supports or straps. In all cases, the furnace should be supported with rods, straps, or angle supports at three locations to properly sup- port the furnace. Place one support at the supply end of the furnace, one support located approximately in the center of the furnace near the blower shelf, and the third support should be at the return end of the fur- nace. Maintain a 6” minimum clearance between the front of the fur- nace and the support rods or straps.
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